Red to violet dyestuff and method of making same.



- and the oxycarboxylic acids of the benzene UNITED STATES PATENT OFFICE.

AUGUST LEOPOLD LASKA, OF OFFENBAOHON-THE-MAIN, GERMANY,

ASSIGNOR TO THE FIRM OF K. OEHLER, ANILIN- & ANILINFARBEN- FABRIK, OF OFFENBACH-ON-THE-MAIN, GERMANY.

RED T O VIOLET DYESTUFF AND METHOD OF MAKING SAME.

:SPEGIFICATION forming part of Letters Patent No. 724,894, dated April 7, 1903.

Application filed November 11, 1902. Serial No. 130,871. (Specimens) To all whom, it nea /y concern:

Be it known that 1,. AUGUST LEoPoLD LASKA, doctor of philosophy, chemist, residing at 5 Gerberstrasse, Offenbach-on-the-Main,

in the Grand Duchy of Hesse, Germany, have series with glycins of the amidonaphthol sulfonic acids, the constitution of which is represented by the following formula:

ox'ycarhoxylic acid of the benzene series OH NH.OH2.COOH 10 3 so na X X meaning a hydrogen atom or a sulfo group. As paradiamins may be used, benzidin,tolidin,dianisidin,paraphenylenediamin,- as oxycarboxylic acids-those of the benzene series and their homologues, as glycins, those of the amidonaphthol sulfonic acids susceptible of combining with diazo compounds. The resulting coloring-matters dye on unmordanted cotton red to violet shades of great fastness to light and acids. They may further be employed for dyeing wool and for preparing fast dyelacs.

The following example illustrates the nature of my invention and in what manner the same may be carried out into practical efiect: 9.2 parts of benzidin are dissolved in 28.6 parts of hydrochloric acid of 20 Baum and two hundred parts of water, then cooled with ice, tetrazotized by means of 6.9 parts sodium Tetr'azotized paradiamin nitrite", then poured into an ice-cold sodaalkaline solution of 7.3 parts of salicylic acid. The intermediate product having been formed, a solution of 17.2 parts of the glycin of the 2.5-amidonaphthol-7-sulfonic acid is added. In order'to complete the formation of the dyestuff, the mixture is stirred for twenty-fourhours,heated up to 80 centigrade, then precipitated with common salt, filtered, pressed, and dried. The dyestuff thus resulting forms a reddish-brown powder, easily soluble in cold water with a red color and dyeing on unmordanted cotton a fast red.

Now what I claim, and desire to secure by Letters Patent, is the following:

1. The manufacture and production of substantive red to violet disazo dyestufis, consisting in the combination of the intermediate products from paradiamins and the oxycarboxylic acids of the benzene series with the glycins' of the amidonaphtholsulfonic acids of the general formula:

on v nrromooon 10 4 T sour x X meaning a hydrogen atom or a sulfo group.

2. As new articles of manufacture the red to bluish-red dyestuifs, which result from the combination of the intermediate products from paradiamins and the oxycarboxylic acids of the benzene series with the glycin of the 2.o-amidonaphthol-7-sulfonic acid of the formula which are easily soluble in water with a red color and dyeing unmordanted cotton in red to bluish-red shades.

3. Asa new article of manufacture the dyestufi of the following constitution:

salicylic acid Benzidin glycin of the 2.5-amidonaphthol-7-sulfonic acid forming a brown powder, dissolving in water AUGUST LEOPOLD LASKA.

Witnesses:

OSKAR STUMHARDT, EVA SATTLER. 

